CN102316552B - Non-network cell searching method of mobile terminal - Google Patents
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Abstract
The invention discloses a non-network cell searching method of a mobile terminal, which comprises the steps of: obtaining a wireless network searching frequency band; carrying out frequency band searching, when the frequency band searching succeeds, entering cell searching, otherwise, regulating a frequency band searching period, and entering a non-network sleep state; entering the cell searching, when the cell searching succeeds, ending a non-network cell searching process, otherwise, regulating the frequency band searching period, entering the non-network sleep state; and when the duration of the non-network sleep state reaches the regulated frequency band searching period, returning and executing the frequency band searching. According to the technical scheme, success information and failure information in a process between the frequency band searching and the cell searching are associated to be a signal variation trend under a non-network environment, the network signal variation trend can be rapidly tracked by using the success information and the failure information, and the non-network cell searching period of the mobile terminal is correspondingly dynamically regulated, and a cell can be rapidly searched when a network signal is restored while the power consumption of the terminal under the non-network searching state is reduced.
Description
Technical field:
The present invention relates to wireless communication field, relate in particular to a kind of non-network cell searching method of mobile terminal.
Background technology:
In wireless communication system, mobile terminal is always attempted resident to suitable residential quarter, to obtaining any wireless network services.In actual environment, because regional access network-free network covers, as the networking initial stage, the zone that can't cover of being caused by reasons such as technology or non-technology, or of short duration access network-free network covers, as the signal coverage hole, the reasons such as network failure, may cause mobile terminal normally residently to suitable residential quarter, not enter without network state.In this case, mobile terminal will constantly be attempted search and resident to suitable or acceptable residential quarter, the search behavior of this mobile terminal under any Cell searching state is called without the network cell search behavior, in case all failures of the trial of arbitrary cells search, mobile terminal will still be in " arbitrary cells search " state, and according to certain searching method, periodically repeat above-mentioned search procedure.
Shown in Figure 1, be the schematic flow sheet of a kind of non-network cell searching method of mobile terminal of the prior art, the method comprises the following steps: step 101, obtain the search frequency range; Step 102, carry out frequency band search, and is successful enter Cell searching, failed progressive rapid 104; Step 103, carry out Cell searching, and is successful stop search, failed progressive rapid 104; Step 104, enter sleep state.When the dormant duration reaches default search cycle, repeated execution of steps 102.The time interval of twice frequency band search behavior before and after search cycle wherein refers to, search cycle is larger, the time of mobile terminal sleeping state continuance is longer, be conducive to save power consumption, search cycle is shorter, the easier recovery of discovering rapidly network signal of mobile terminal, search available residential quarter.
By the research to prior art, the inventor finds, non-network cell searching method of mobile terminal of the prior art, the search of adopting the fixed cycle more, namely, the time of twice frequency band search behavior is fixed, and causes being unfavorable for searching fast residential quarter when network signal recovers when having chosen the long search cycle, when having chosen the shorter search cycle, the power consumption of search can significantly increase.
Summary of the invention
For solving the problems of the technologies described above, the object of the present invention is to provide a kind of non-network cell searching method of mobile terminal, make this searching method can network state residing according to mobile terminal, adjust dynamically the search cycle, when reducing to search for power consumption, search fast residential quarter.
For achieving the above object, the invention provides following technical scheme:
A kind of non-network cell searching method of mobile terminal, is characterized in that, comprising:
Obtain the wireless network search frequency range;
Carry out frequency band search, when the frequency band search success, enter Cell searching, otherwise, adjust the frequency band search cycle, and enter without the network sleep state;
Carry out Cell searching, when the Cell searching success, finish without the network cell search procedure, otherwise, adjust the frequency band search cycle, and enter without the network sleep state;
Frequency band search week after date after dormant lasting duration reaches adjustment without network, return to and carry out described frequency band search.
Preferably, when the frequency band search failure, in the described adjustment frequency band search cycle, comprising:
In the time interval of twice frequency band search behavior before and after increasing, the duration of increase is the first duration.
Preferably, described Cell searching comprises:
Carry out slightly synchronously, if success enters carefully synchronously, otherwise Cell searching is failed;
Carry out carefully synchronously, if success enters read system message, otherwise, the Cell searching failure;
Read system message, if success, Cell searching success, otherwise, the Cell searching failure.
Preferably, when the Cell searching failure, in the described adjustment frequency band search cycle, comprising:
When thick synchronization failure, in the time interval of twice frequency band search behavior before and after increasing, the duration of increase is the second duration;
When thin synchronization failure, in the time interval of twice frequency band search behavior before and after reducing, the duration that reduces is the 3rd duration;
When the read system message failure, in the time interval of twice frequency band search behavior before and after reducing, the duration that reduces is the 4th duration.
Preferably, after the Cell searching success, also comprise:
The available cell that searches is reported application layer, and the frequency band search cycle is set to initial value.
Preferably, described the first duration is greater than described the second duration.
Preferably, described the 4th duration is greater than described the 3rd duration.
Preferably, described frequency band search comprises:
According to without web search frequency range and access module information, the frequency range under different access modules is searched for;
Calculate the received signal strength indicator of frequency under each access module, obtain the frequency power list;
Judge whether to exist the frequency that surpasses default power threshold, if so, frequency band search success, otherwise frequency band search failure.
Preferably, after frequency band search success, according to power by strong to the weak arranged sequentially described frequency list that surpasses default power threshold;
Carry out described Cell searching according to the frequency power list by strong extremely weak order.
Preferably, after the frequency band search success, upgrade as follows described default power threshold:
Calculate the current power smooth value that surpasses the frequency of default threshold power;
Former default power threshold and the current power smooth value that surpasses the frequency of default threshold power are carried out level and smooth computing, obtain new power threshold, the power threshold that the power threshold that newly obtains is set to preset.the technical scheme that the application embodiment of the present invention provides, be without net environment signal intensity trend with the success and failure information association of frequency band search and Cell searching pilot process, when frequency search failure and Cell searching failure, according to the cycle of default formula adjustment search, the information of utilizing frequency search failure and Cell searching to acquire, can follow the tracks of rapidly reaction network signal intensity trend, by corresponding dynamic adjustment mobile terminal without the network cell search cycle, under reducing without the web search state in power consumption of terminal, can when recovering, network signal search fast residential quarter.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the schematic flow sheet of a kind of non-network cell searching method of mobile terminal of the prior art;
The schematic flow sheet of the non-network cell searching method of mobile terminal that provides in the embodiment of the present invention one is provided Fig. 2;
The schematic flow sheet of the frequency band searching method that provides in the embodiment of the present invention two is provided Fig. 3;
The schematic flow sheet of the small region search method that provides in three in the invention process is provided Fig. 4.
Embodiment
In the framework of mobile terminal without the network cell search, application and upper-layer protocol are responsible for controlling starting and stopping without the network cell search routine, access module RAT (Radio Access Technology according to the mobile terminal support, wireless access technology), application and high level enter the sleep holding state after choosing the search frequency range and notifying physical layer.Physical layer protocol is responsible for without the network cell search procedure, and only when searching available cell, just notice is applied and be high-rise.The complete independence of the relatively independent and physical layer protocol of protocol module workflow to search routine, mutual in the time of can reducing to greatest extent to search for without network cell between protocol layer, thereby reduce mobile terminal power consumption, therefore, the searching method of physical layer is power consumption and the Service Quality Metrics key of whole mobile terminal.
Choosing of physical layer searching method, search cycle and search capability are conclusive, and search capability is relevant to the physical layer algorithm, and the present invention mainly studies how to choose the suitable search cycle.The time interval of twice frequency band search behavior before and after the search cycle here refers to.Search cycle is larger, mean that the length of one's sleep is longer, more be conducive to mobile terminal and save power consumption, but to the signal without net environment, recover to respond slower, search cycle is less, the mobile terminal to search power consumption increases, but can the easier recovery of discovering rapidly network signal, searches available residential quarter.
For this reason, the present invention proposes a kind of non-network cell searching method of mobile terminal, comprising: obtain the wireless network search frequency range; Carry out frequency band search, when the frequency band search success, enter Cell searching, otherwise, adjust the frequency band search cycle, and enter without the network sleep state; Carry out Cell searching, when the Cell searching success, finish without the network cell search procedure, otherwise, adjust the frequency band search cycle, and enter without the network sleep state; Frequency band search week after date after dormant lasting duration reaches adjustment without network, return to and carry out described frequency band search.
The method is without net environment signal intensity trend with the success and failure information association of frequency band search and Cell searching pilot process, and the corresponding mobile terminal of dynamically adjusting is without the network cell search cycle, in power consumption of terminal, can when recovering, network signal search fast residential quarter under reducing without the web search state.
It is more than the application's core concept,, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment that obtains, belong to the scope of protection of the invention.
Embodiment one:
Shown in Figure 1, the schematic flow sheet of a kind of non-network cell searching method of mobile terminal that provides for the embodiment of the present invention, the method comprises the following steps:
Step S201, obtain without the web search frequency range.
Mobile terminal after all attempt unsuccessfully at Cell searching, enters without the web search flow process, and the RAT (Radio Access Technology) that upper-layer protocol is supported according to terminal arranges the search frequency range and also notifies physical layer.Described RAT comprises GSM, GPRS, EDGE, TD-SCDMA, TD-LTE, WCDMA, CDMA2000 etc.
Step S202, carry out frequency band search, judges whether frequency band search is successful, when the frequency band search success, enters step S203, otherwise, enter step S204.
Step S203, carry out Cell searching, judges whether Cell searching is successful, when the Cell searching success, finish without the network cell search procedure, otherwise, enter step S204.
After Cell searching success, think in the current network environment residential quarter that exists mobile terminal to use, finish without the network cell search routine this moment, and the residential quarter that physical layer protocol will search reports the application layer contour level.
Step S204, adjust the frequency band search cycle.
Step S205, enter without the network sleep state.Frequency band search week after date after dormant lasting duration reaches described adjustment without network, return to and perform step S202.
Embodiment two:
In the non-network cell searching method of mobile terminal that embodiment one provides, described frequency band search specifically can comprise the following steps:
Step S301,, according to without web search frequency range and RAT information, search for the frequency range under different RAT.
Step S302, calculate the received signal strength indicator of frequency under each RAT, obtains the list of frequency power searching.
Calculate the RSSI (Received Signal Strength Indication, received signal strength indicator) that may have frequency under each RAT, obtain the power searching list, as shown in Equation 1:
RSSI
Rat (i), j={RSSI
j, j=0,1,2 ... N
max(formula 1)
Wherein, rat (i) is different access module, N
maxFor the maximum frequency number under corresponding access module.
RSSI is the power level of terminal according to the wireless receiving calculated signals, comprises signal and interference sections, can be used for tentatively judging wireless signal in the current network environment strength distribution situation that has that it's too late.
Step S303, judge whether to exist the frequency that surpasses default power threshold, if so, and frequency band search success, otherwise frequency band search failure.
According to default power threshold P
Th, rat (i), screening surpasses the frequency of RSSI power threshold, if the power measurement values of the frequency of supporting under all access modules does not all surpass the default thresholding of corresponding power, the frequency band search failure is described, finishes fast the current search flow process, without the network sleep state; If there is the frequency that surpasses default power threshold, otherwise the success of explanation frequency band search.
If frequency band search failure, present complete network is described without covering, should significantly increases mobile terminal without the network cell search cycle, the time interval of twice frequency band search behavior before and after namely increasing, the duration that increases is the first duration, and specific implementation can be as follows:
Adjust the frequency band search cycle according to formula 2 and formula 3,
After the frequency band search failure, the value of k is set according to formula 3,
K=k+step 1 (formula 3),
Wherein, T
csFor the frequency band search cycle, its unit can be second, T
fFor default fixed value, β adjusts the factor for the default cycle, and k is for adjusting parameter, K
minFor the initial value of k, K
maxFor the maximum of k, step1 is default adjustment step-length.K
minCan be in order to limit the minimum value of k, to prevent the power consumption of search operation increase terminal frequently, K
maxCan be in order to limit the maximum of k, to prevent causing terminal can not in time know the recovery of network signal because the search cycle is long.
In addition, default power threshold P
Th, rat (i)Choose not only as making the basis for estimation of frequency band search success and failure, the frequency number that obtains after filtering according to it also affects the time of subsequent searches flow process, so default power threshold P
Th, rat (i)Reasonability seem particularly important, therefore, the non-network cell searching method of mobile terminal that the embodiment of the present invention provides after frequency band search success, can also comprise:
Upgrade described default power threshold.The method of upgrading power threshold is as follows:
Calculate the current power smooth value that surpasses the frequency of default threshold power;
Former default power threshold and the current power smooth value that surpasses the frequency of default threshold power are carried out level and smooth computing, obtain new power threshold, the power threshold that the power threshold that newly obtains is set to preset.
Its concrete methods of realizing is as follows:
Calculate the current power smooth value P that surpasses the frequency of default threshold power according to formula 4
Smth, rat (i),
Wherein, N is the frequency number that power surpasses default thresholding, α
nFor the weight coefficient of frequency, RSSI
nPerformance number for frequency;
For increasing the reliability of default power threshold, the impact that brings to reduce the signal transient sudden change, the default power threshold of twice of front and back is carried out level and smooth computing according to formula 5:
P
Th, rat (i)=λ * P
Th, rat (i)+ (1-λ) * P
Smth, rat (i)(formula 5),
Wherein, P
Th, rat (i)For default power threshold, P
Smth, rat (i)For the current power smooth value that surpasses the frequency of default threshold power, λ is smoothing factor.Described default power threshold P
Th, rat (i)Initial value can be minimum demodulating sensitivity level under each access module.
In order to make follow-up Cell searching high-quality and high-efficiency more, improve search quality, and further reduced the power consumption of search, can also comprise after the frequency band search success:
According to power by strong to the weak arranged sequentially described frequency list that surpasses default power threshold;
Carry out described Cell searching according to the frequency power list by strong extremely weak order.
in the present embodiment, other step and embodiment one can cross-references, do not repeat them here, in the technical scheme that the present embodiment provides, the rssi measurement result has reflected the signal power distribution situation of search frequency range, according to default power threshold, if the rssi measurement result is lower than power threshold, be judged as without network signal, and according to the frequency band search result, adjust the search cycle, this scheme can realize when reducing to search for power consumption, search fast residential quarter, the power threshold of presetting by renewal simultaneously, make follow-up Cell searching high-quality and high-efficiency more, improved search quality, and further reduced power consumption without terminal under the web search state.
Embodiment three:
To difference access cell system, its frame structure, modulation, coded system difference, and the details that realizes of different terminals producer also is not quite similar, but the basic skills of Cell searching and flow process are generally similar, therefore cell search process divided into roughly thick synchronous, thin synchronous and 3 subprocess of read system message process, therefore, shown in Figure 4, in the non-network cell searching method of mobile terminal that embodiment one provides, described Cell searching specifically can comprise the following steps:
Step S401, thick synchronous, refer to obtain frame initial synchronisation regularly, if success enters step S402, otherwise, the Cell searching failure.The detection of synchronizing channel (or reference signal, synchronizing sequence) is successfully this process success or failed unique authentic communication of judgement.In this step, can according to frequency band power by strong to the weak Cell searching that carries out successively.
Step S402, thin synchronous, refer to obtain frame precise synchronization regularly, and obtain residential quarter ID, if success enters step S403, otherwise, the Cell searching failure.Whether residential quarter ID obtains is successfully this process success or failed unique authentic communication of judgement.
Step S403, read system message, refer to broadcast channel is carried out descending reception, demodulation, decoding, reads the network frame number, if success, Cell searching success, otherwise, the Cell searching failure.CRC (Cyclic Redundancy Check, decoding cyclic redundancy check (CRC)) result is this process success or failed unique authentic communication of judgement.
Take the TD-LTE system as example, slightly synchronously be the PSS signal detection process, fine synchronization refers to the testing process of SSS signal, if the success of SSS input, according to Nid1, Nid2 calculation plot ID.In the TD-SCDMA system, thick synchronously finger obtains the DwPTS testing process, thin is synchronously basic Midamble code testing process, if basic Midamble code detects successfully exports corresponding residential quarter ID, in the GSM/GPRS/EDGE system, the thick detection FCCH channel that synchronously refers to, thin synchronous for detecting the SCH channel.
In three subprocess of above-mentioned Cell searching, the success of last process is the necessary condition that starts of next process always, in case certain procedure failure, whole Cell searching flow process failure.In the process of Cell searching, record success or the failure information of each process under different RAT.As long as searched available cell under any one access module, the Cell searching success is described.
According to the failed indication of different phase in cell search process, can choose different adjustment step-lengths to upgrade the cycle of lower whorl mobile terminal without the network cell search, can adjust as follows the frequency band search cycle:
When thick synchronization failure, in the time interval of twice frequency band search behavior before and after increasing, the duration of increase is the second duration;
When thin synchronization failure, in the time interval of twice frequency band search behavior before and after reducing, the duration that reduces is the 3rd duration;
When the read system message failure, in the time interval of twice frequency band search behavior before and after reducing, the duration that reduces is the 4th duration.
Its specific implementation is as follows:
Calculate the cycle of mobile terminal without the network cell search according to formula 6:
After thick synchronization failure, upgrade the value of k according to formula 7:
K=k+strp 2 (formula 7);
After thin synchronization failure, upgrade the value of k according to formula 8:
K=k-step 3 (formula 8);
After the read system message failure, upgrade the value of k according to formula 9:
K=k-step 4 (formula 9);
After the read system message success, i.e. after Cell searching success, the frequency band search cycle can be set to initial value, realize in the following manner:
Upgrade the value of k: k=K according to formula 10
min(formula 10).
Wherein, T
csFor the frequency band search cycle, its unit can be second, T
fFor default fixed value, β adjusts the factor for the default cycle, and k is for adjusting parameter, K
minFor the initial value of k, K
maxFor the maximum of k, infinitely increase for avoiding the length of one's sleep, restriction k maximum is no more than K
max, step2, step3 and step4 are default adjustment step-length.K
minCan be in order to limit the minimum value of k, to prevent the power consumption of search operation increase terminal frequently, K
maxCan be in order to limit the maximum of k, to prevent causing terminal can not in time know the recovery of network signal because the search cycle is long.
In addition, if frequency band search failure, can think that complete network is without covering, need to significantly increase the search cycle, if thick synchronization failure is thought the second-rate of network signal, can not be for for mobile terminal, providing respective service, needing increases the search cycle, therefore, can retrain described the first duration greater than described the second duration.Concrete, retrain described step1 greater than described step2.
If carefully synchronously obtain residential quarter ID success, think that network signal recovers, need to shorten the search cycle, if read system message success, think in network environment and have available residential quarter, need to significantly shorten the search cycle, therefore, can retrain described the 4th duration greater than described the 3rd duration.Concrete, retrain described step1 greater than described step2.
In the present embodiment, other step and embodiment one and embodiment two can cross-references, do not repeat them here, in the technical scheme that the present embodiment provides, cell search process is divided into the slightly thin synchronous and reading cell system message process in synchronous, residential quarter of residential quarter of obtaining, according to success and the failed indication information of these steps, chooses corresponding search cycle adjustment step-length.Cell searching different phase successful, unsuccessfully indication characterizes the signal quality of the network coverage, the information such as interference level.Utilize these information tracking network signal intensity trend rapidly, and the corresponding mobile terminal of dynamically adjusting when reducing to search for power consumption, can search residential quarter without the network cell search cycle fast.
The technical scheme that the application embodiment of the present invention provides, be without net environment signal intensity trend by the success and failure information association with frequency band search and Cell searching pilot process, utilize these information tracking network signal intensity trend rapidly, and the corresponding mobile terminal of dynamically adjusting is without the network cell search cycle, in power consumption of terminal, can when recovering, network signal search fast residential quarter under reducing without the web search state.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment that between each embodiment, identical similar part is mutually referring to getting final product., to the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent for those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from the spirit or scope of the present invention, realization in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (7)
1. a non-network cell searching method of mobile terminal, is characterized in that, comprising:
Obtain the wireless network search frequency range;
Carry out frequency band search, when the frequency band search success, enter Cell searching, otherwise, adjust the frequency band search cycle, and enter without the network sleep state, in the wherein said adjustment frequency band search cycle, comprising:
In the time interval of twice frequency band search behavior before and after increasing, the duration of increase is the first duration;
Carry out Cell searching, when the Cell searching success, finish without the network cell search procedure, otherwise, to adjust the frequency band search cycle, and enter without the network sleep state, wherein said Cell searching comprises:
Carry out slightly synchronously, if success enters carefully synchronously, otherwise in the time interval of increase by the twice frequency band search behavior in front and back, the duration of increase is the second duration;
Carry out carefully synchronously, if success enters read system message, otherwise in the time interval of twice frequency band search behavior before and after reducing, the duration that reduces is the 3rd duration;
Read system message, if success, Cell searching success, otherwise in the time interval of twice frequency band search behavior before and after reducing, the duration that reduces is the 4th duration;
Frequency band search week after date after dormant lasting duration reaches adjustment without network, return to and carry out described frequency band search.
2. method according to claim 1, is characterized in that, after the Cell searching success, also comprises:
The available cell that searches is reported application layer, and the frequency band search cycle is set to initial value.
3. method according to claim 1 is characterized in that:
Described the first duration is greater than described the second duration.
4. method according to claim 1 is characterized in that:
Described the 4th duration is greater than described the 3rd duration.
5. method according to claim 1, is characterized in that, described frequency band search comprises:
According to without web search frequency range and access module information, the frequency range under different access modules is searched for;
Calculate the received signal strength indicator of frequency under each access module, obtain the frequency power list;
Judge whether to exist the frequency that surpasses default power threshold, if so, frequency band search success, otherwise frequency band search failure.
6. method according to claim 5 is characterized in that:
After frequency band search success, according to power by strong to the weak arranged sequentially described frequency that surpasses default power threshold;
Carry out described Cell searching according to frequency power list intermediate-frequeney point power by strong extremely weak order.
7. method according to claim 5, is characterized in that, after the frequency band search success, also comprises, upgrades as follows described default power threshold:
Calculate the current power smooth value that surpasses the frequency of default power threshold;
Former default power threshold and the current power smooth value that surpasses the frequency of default power threshold are carried out level and smooth computing, obtain new power threshold, the power threshold that the power threshold that newly obtains is set to preset.
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